Ok, some update. I've installed ubuntu and i've tried heaven benchmarks without drivers, don't works.
I've tried a sw called "GpuTest_Linux" and it shows some triangle in a window but without GPU-Z i can't tell if it's the CPU or GPU that works. The only thing i know is that the CPU was almost flat out, but it's a C2D E8300, it will bottleneck a 7970 in every way possible.
After that i was trying to install the AMD drivers but, maybe i'm dumb, but i can't, i double click and nothing, i really don't know nor undertand how to install them, moreover, i'm without internet down in the basement

The driver I don't have much experience with, I only know about how to get it when connected to the internet. and was the triangle showing Red blue and green on each corner? If so, thats a OpenGL stresstest.

I've called a repair shop, he told me that "soldering 12 modules i 95% killing the VGA".
I'm a brave man, and i can't stand a piece of silicon to defeat me. I'm going for soldering. In theory, that module is H5GQ2H24MFR-R0C but there is the H5GQ2H24MFR-T2C as well, and that is confusing me

So i have 2 options:
MFR: they cost 4€ each, more or less, so for 13 of those (i want to be sure, i i get 12, one will be DOA, i'm sure, because i'm lucky)
AFR: they cost 2€ each, more or less, but they are in contrast with that sw.

Also, looking at those numbers, just before "AFR" there is a 24 that stands for:
2: organization x32
4: number of banks= 16

So, in theory, they are the same damn module, but why Hynix change his mind?
I'm sorry if i'm writing a lot but i need someone who can tell me if my way of thinking is good or not.

Wrapping it up, whatever chip i'll go for, 1sr or 2nd generation, until i'm using those 2gb model so with the number 4 with 16 banks and R0C at the end that means 3.0GHz, i'm safe right?
Even because most of those modules are old (Elpida ones costs more than 6€ for example and they are out of stock)...

GL on getting this thing working, although if its damage to the core instead of the memory you're hosed.

Don't say that

Yes i was thinking about that but i'm pretty confident the core is good. As i said, i got this card for free and i've found some new vram chips for 30 bucks so why not try?

Moreover, if it's the core i think that won't post at all or display some image. Instead this card is still displaying image with no artifacts. I've also look at the bios, boot clock is 925mhz @1.175v, so if it can do that without crashing, i'm pretty confident the core is good.

Otherwise i will have 30 bucks less and a cool paperweight.

BTW, if you know some stress thest for the core that do not use drivers or a tons of memory i can try that, no problem

Yes i was thinking about that but i'm pretty confident the core is good. As i said, i got this card for free and i've found some new vram chips for 30 bucks so why not try?

Moreover, if it's the core i think that won't post at all or display some image. Instead this card is still displaying image with no artifacts. I've also look at the bios, boot clock is 925mhz @1.175v, so if it can do that without crashing, i'm pretty confident the core is good.

Otherwise i will have 30 bucks less and a cool paperweight.

BTW, if you know some stress thest for the core that do not use drivers or a tons of memory i can try that, no problem

Well, there's more than one thing on the actual GPU that could go bad that allow for good basic output, but nothing more than that.

And have you tried cleaning up the crap around and on the GPU? If thats conductive/capacitive it could throw things off a bit.